Finding the Fourth Proportional to 31,096.54, 42,931.01 and 20,504.64

Step by Step Solution

1. Step 1: Write the proportion equation
   31,096.54 : 42,931.01 = 20,504.64 : x
2. Step 2: Convert to fraction form
   31,096.54/42,931.01 = 20,504.64/x
3. Step 3: Cross multiply
   31,096.54x = 42,931.01 × 20,504.64
4. Step 4: Simplify right side
   31,096.54x = 880,285,117.14
5. Step 5: Solve for x
   x = 880,285,117.14/31,096.54
6. Step 6: Final answer
   x = 28,308.14